The current List of known big warlock bugs. If you know more please add in the comments and I will update the topic.
1. [Warlock] Soul Well and Pact of Gluttony bug
Soul well again gives warlock a normal health stone instead of Demonic healthstone on arena and BGS.
It was fixed somewhere in the past when Warlock with Pact of gluttony would recieve a Demonic healthstone from the soul well while others get a normal health stones.
2. [Hero talents] Diabolist targeting issues of Pit lord and Mother of Chaos.
The old bug of Diabolist warlock from start of TWW returned - Demons of Diabolist hero talents - Pit lord and Mother of Chaos attack closest target that is in combat with warlock player, rather than attacking the actual target.
> https://youtu.be/z7V3SOmsX5U
3. [Warlock] Soul leech BUG - Needs to be fixed ASAP
4. [Demonology] Broken interaction between Umbral Blaze and Wicked Maw talents
Damage of Umbral blaze is not increased when Wicked Maw Debuff is applied to the target.
5. [Demonology] Shadow Invocation Talent Bug New in 11.2
Shadow Invocation doesn’t proc Bilescourge bomber from DoT effects in 11.2 - Pre 11.2 Bilescourge bomber could have been procced from the DoT ticks of DoTs from corruption and Soul Harvester hero talents.
6. [Destro] Bane of Havoc bug
Destro PvP talent Bane of Havoc doesn’t interact and duplicate any hero talent abilities, while normal version of Havoc works as intended.
7. [Tier set] Inquisitor's feast of madness - Diabolist tier set.
When your pet is on the passive mode and doesn’t attack target, oculus doesn’t trigger the explosion.
8. [Demonology] Umbral blaze.
Umbral blaze is not affected by the haste stat.